:root {
  --primary: #1f5a30;
  --on-primary: #ffffff;
  --primary-container: #e8f5e9;
  --on-primary-container: #0b2412;
  --surface: #fbfdf9;
  --on-surface: #191c19;
  --on-surface-variant: #404943;
  --outline: #6f7a72;
  --radius: 16px;
  font-family: Roboto, system-ui, -apple-system, "Segoe UI", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --primary: #9ad7a8;
    --on-primary: #00391a;
    --primary-container: #1c3524;
    --on-primary-container: #d6f0dc;
    --surface: #101411;
    --on-surface: #e1e3dd;
    --on-surface-variant: #c0c9c1;
    --outline: #8a938b;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--surface);
  color: var(--on-surface);
  line-height: 1.6;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--primary);
  color: var(--on-primary);
  padding: 12px 16px;
  z-index: 10;
}
.skip-link:focus { left: 8px; top: 8px; }

a { color: var(--primary); }
:focus-visible { outline: 3px solid var(--primary); outline-offset: 3px; }

header, main, footer { max-width: 960px; margin: 0 auto; padding: 16px 24px; }

.brand { display: flex; align-items: center; gap: 12px; font-size: 1.375rem; font-weight: 500; }
.brand img { width: 48px; height: 48px; }

.hero { padding-block: 48px 32px; }
.hero h1 { font-size: clamp(2rem, 6vw, 3.25rem); line-height: 1.15; margin: 0 0 16px; }
.hero p { font-size: 1.25rem; color: var(--on-surface-variant); max-width: 40ch; margin: 0 0 24px; }

.button {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0 24px;
  border-radius: 100px;
  background: var(--primary);
  color: var(--on-primary);
  font-weight: 500;
  text-decoration: none;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  padding: 0;
  margin: 32px 0;
  list-style: none;
}
.features li {
  background: var(--primary-container);
  color: var(--on-primary-container);
  border-radius: var(--radius);
  padding: 24px;
}
.features h2 { font-size: 1.125rem; margin: 0 0 8px; }
.features p { margin: 0; }

footer { color: var(--on-surface-variant); font-size: 0.875rem; }

.card { background: var(--primary-container); color: var(--on-primary-container); border-radius: var(--radius); padding: 24px; }
code.token { display: block; overflow-wrap: anywhere; padding: 12px; margin: 16px 0; border: 1px solid var(--outline); border-radius: 8px; }

@media (max-width: 480px) {
  header, main, footer { padding-inline: 16px; }
  .hero { padding-block: 24px; }
}